diff --git a/src/editfns.c b/src/editfns.c
index fe29bb8ae20..3c14d6210a5 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -51,6 +51,8 @@ Lisp_Object Vbuffer_access_fontify_functions;
 Lisp_Object Qbuffer_access_fontify_functions;
 Lisp_Object Vbuffer_access_fontified_property;
 
+Lisp_Object Fuser_full_name ();
+
 /* Some static data, and a function to initialize it for each run */
 
 Lisp_Object Vsystem_name;